we are looking obviously at former bush, below him, former president clinton, and former president clinton joined by hillary, the former secretary of state, and daughter chelsea. they're here, former president bush and his wife, laura there as well. there's been music mixed into the memorial since before it began. music was the first thing we heard this morning. most of it coming from the crowd, but then as soon as they got the sound system up and going, we heard it, we're hearing it now. ♪ >> you know what's so key about this, when you look at all of these leaders, just imagine the south african authorities trying to lias with the security detail with the heads of state. >> president obama is approaching the podium now. he's the next speaker up. that's what we're waiting on. ♪ our life is in your hands >> now, there have been a lot of questions raised about security here and before i came on, we were talking around and talking to security officials. >> castro, he's shaking hands with raul castro. >> as christiane points out, president obama just shook hands with raul castro from cuba.